2 papers
astro-ph.GA2026
A redshift of z=3.20 for the bright arc in eMACSJ2229.9-0808: Comment on Wagner & Falco (2026) "Hamilton's Object revisited: A challenging source redshift of a strong lensing configuration"
Ian Smail, Johan Richard, Harald Ebeling +1
We re-analyse near-infrared and optical spectroscopy from the Subaru, Gemini, and Keck telescopes of the bright gravitational arc seen in the z=0.62 X-ray cluster eMACSJ2229.9-0808…
astro-ph.CO2026
Predisposition of galaxy clusters to producing exotic hyperbolic umbilic lensing configurations
Quentin Basto, Johan Richard, David J. Lagattuta +2
Strong gravitational lensing is a powerful tool for investigating the universe's large-scale structure and understanding the properties of dark matter and dark energy. The magnific…